大叶白蜡蒸腾作用特征研究

Transpiration Features of Fraxinus Rhynchophylla

对北京山区落叶阔叶林大叶白蜡蒸腾速率进行了一个生长季的连续测定,结果表明影响其蒸腾速率的 因子主要是气孔阻力、叶面温度、大气相对湿度、土层厚度、叶室温度、太阳辐射强度．对大叶白蜡叶片气孔阻力和 蒸腾速率相关关系的分析结果显示,蒸腾速率和气孔阻力之间是一种非线性关系,其方程为:TR大叶白蜡=10.6- 4．67ln(RT)．

In all growth season, we measured the transpiration rate （TR） of Fraxinus rhynchophylla in deciduous broad - leaved forest in Beijing Mountain zone. The results showed the major factors to affect transpiration of plants are stomatal resistance （ RT）, leaf temperature（ LT）, relatively humidity（ RH）, soil depth（ H）, chamber temperature（AT） and solar radiation（P）. According to analysis the relationship between transpiration and stomatal resistance of Fraxinus rhynchophylla, the results indicate there is no - linear relationship. The equation are following： TR大叶白蜡 = 10.6 -4. 671n（RT）.